Buzzer.



- R. l. UTTER.

BUZZER.

APPLICATION FILED SEPT-8,1914.

Patented July 11, 1916.

- JZTZL/EZZZETI' BZ'CZYEFL? f. Z] Z [2 21 RICHARD I. UTTER, OF CHICAGO,ILLINOIS, ASSIGNOB TO KELLOGG SW'ITOI-IBOARD AND SUPPLY COMPANY, OFCHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS.

BUZZER.

rreaeoe.

Specification of Letters Patent.

Patented July 11, 1916.

Application filed September 8, 1914. Serial No. 860,556.

To all whom it may concern Be it known that I, RICHARD I. U'r'rnn, acitizen of the United States of America, residing in Chicago, county ofCook, and State of IJinois, have invented certain new and usefulImprovements in Buzzers, of which the following is a specification.

My invention relates to electrically operated buzzers or bells and hasfor its object an improved arrangement by which the strength of themagnets is varied to bring about the positive attraction and retractionof the armature when the magnet circuit is closed.

A feature of my invention is the use of a line link chain which mayeither interrupt the magnet circuit entirely or vary the resistance 0fthe circuit in which it is included to such an extent as will result inthe attraction and release of the armature of the buzzer to produce anaudible signal. By the use of this fine link chain I eliminate allexpensive contacts which are commonly used and this results in a buzzerwhich is very simple in construction, cheap to manufacture, mostpositive in operation and less likely to get out of order.

For a more complete understanding of my invention reference is to be hadto the accompanying drawing in which like reference characters denotelike parts and in which Figure 1 is a face view of my buzzer with partsshown at normal and the protecting cover removed; Fig. 2 is a right sideelevation of Fig. 1 showing its cover in section; Fig. 3 is a top viewof Fig. 1 showing the cover in section; Fig. 4: is a view similar toFig. 1 but with parts in their actuated position; and Fig. 5 illustratesdiagrammatically the buzzer connected in an operating circuit.

Referring now more in detail to the preferred form of my invention asillustrated, it comprises a base 1, having portions 2 and 3 struck upfrom it, the portion 2 being bent at right angles to the base 1 andserving as a mounting plate for the magnets 4: and 5, they beingsuitably fastened to the portion 2 by means of the screws 6. A portion 3is also bent at right angles to the base and has the two lugs 7 and 8formed upon it, and forms supporting means for an armature 9. Thearmature 9 has the lugs 10 and 11 inteto it.

gral with it, the said lugs fitting between the lugs 7 and 8. Pin 12passes-tln'ough the lug 7 and 8 of the portion 3 and lugs 10 and 11 ofthe armature 9 and pivotally supports the armature in the portion A.tension spring 13 is suitably fastened to the armature 9 and serves as arestoring spring to restore the armature to its adjusted position whenthe energizing circuit for the magnets l and 5 is interrupted as will behereinafter described.

In carrying out my invention for varying the strength of the magnets atand 5, so as to attract and release the armature, I provide a fine linkchain 1-1- which is fastened at one end to the free end of the armatpre9 by means of a loop or screw eye 15 which is suitably fastened to thesaid armature. To secure adjusting means for the armature so as to havea proper air gap between the armature and its pole pieces, I provide ascrew 16 which is threaded into a terminal 17, the said terminal beingsecured to the extension 18 of the spool head 18 of magnet 1 in asuitable manner. A. swivel 19 is secured to the end of the screw 16 towhich the other end of the fine link chain 11 is fastened. I use theswivel joint so that when the screw 16 is turned to give the armature 9its proper adjustment the chain will not be twisted, and to hold thearmature 9 in its proper adjustment a lock nut 20 is provided to holdthe screw against rotation.

Referring to Fig. 5, the operation of the buzzer will now be described.In thediagrammatic circuit I show a push button 21 and battery 22 incircuit with the buzzer. Terminals 23 and 24 are provided and aremounted on the base 1, the terminal 23 being suitably insulated from thesaid base while the terminal 24 is directly connected Now when thebutton 21 is operated to close its contact 25 the magnets 1 and 5 areenergized over a circuit traced from the negative pole of battery 22,closed contact 25 of button 21, terminal 23 and winding of the magnets41 and 5, conductor 26, terminal 17 screw 16, links 1 1-, armature 9,base 1, terminal 24 to the other side of the battery 22. Magnets 4; and5 are thus energized to attract the armature 9. When the armature is inits normal position the chain 1 1 is held taut by reason of the spring13 Which holds the armature 9 in its normally adjusted position and saidchainbeing taut formsa conducting meansfor the current from the battery22 when the circuit is'closed at push button 21. f The armaturebeingattracted as above described, the chain slackens and thisslackening produces high the push button 21 is closed the buzzer will'be operated by reason of the chain being slack when the'armature -isattracted and taut when the armature is released.

lVhile I have described one certain form of invention 1 do not wish tobelimited to the same as I contemplate applying my invention in other waysthan illustrated and- I aim to cover all such changes and modificationsas come within the spirit and scope of the appended claims:

Haylng described my invention What I claim as new and desire to secureby United States Letters Patent is: V

1. A buzzer comprising an electromagnet and normally retracted armature,circuit 7 connections for the electromagnet, and a normally tautlinkchain included in said circuit connections and controlled by saidarmature whereby when the armature is attracted said chain becomes slackto vary the resistance of the clrcuit to cause a retraction V ofthearmature.

whereby when the armature is attracted said normal engagement betweensaid linksis changed to eiiect said, circuit connections so as to causea retraction of the armature.

3, A buzzer comprising an electromagnet and normally retracted armature,circuit connections for the electromagnet, and a normally taut linkchain included in said circuit connections and controlled bysaid'armature whereby when the armature is attractedthe links of saidchain ovary their relative position to efi'ect' said circuit connectionsso. as to cause a retraction of the armature.

4. A buzzer comprising an electromagnet and normally retracted armature,terminals for the buzzer, circuitconnections extending from one terminalthrough the winding of said eleotromagnet to the other terminal, aconductive link chain included in said circuit connections andcontrolled by said armature whereby when the armature is attracted thelinks of said chain vary their relative position to increase theresistance of said circuit connections between the terminals so as tocause a retraction of the armature.

5. A device of the character described comprising an electromagnet, anarmature for said electromagnet normally under spring tension, a linkchain for holding said armature in its normal position, circuitconnections for said electromagnet including said; link chain, and meansfor closing a circuit through said magnet whereby said armature isattracted and said chain becomes slack to vary the resistance of thecircuitwhereby said armature 1S retracted.

6. A buzzer comprising an electromagnet provided with terminals, anarmature for said electromagnet, a link chain connecting one of saidterminals to said armature, circuit connections for said electromagnetincluding said chain and said armature, means for closing said circuitwhereby said armature is attracted and the said chain operates to varythe resistance of the circuit to cause a retraction of the saidarmature.

7. A device of the character described 7 comprising an electromagnet, anormally resaid armature is attracted and said chain 100 becomes slackincreasing the resistance of the circuit to cause a retractlon of thearmature.

Signed by me at Chicago, county of Cook and State of Illinois, in thepresence of two 105 witnesses.

RICHARD I. UTTER. Vitnesses GEORGE E. MUELLER, B; OBRIEN.

Copies of-this patent may be obtained for five cents each, by addressingthe Commissioner of Patents 2 Washington, D. 0.

